Powdered metal casing for perforating charge and its method of manufacture Patent #: 4220687
ApplicationNo. 06/311105 filed on 10/13/1981
US Classes:175/4.6, Concave-shaped charge102/306, Shaped charge or charge with detonation wave cavity modifier102/476Shaped charge
ExaminersPrimary: Novosad, Stephen J.
Assistant: Bui, Thuy M.
Attorney, Agent or Firm
International ClassesE21B 43/11 (20060101)
E21B 43/117 (20060101)
F42B 3/08 (20060101)
F42B 3/00 (20060101)
AbstractA shaped charge unit for well perforating having a outer shell with an internal cavity formed therein. An explosive charge material conforms in exterior shape with the inside surface of the cavity and is retained in place by a conical liner of non-explosive material. The interior shape of the cavity is such that an increased amount of explosive material is provided in a circumferential channel located proximate to the periphery of the base of the conical liner.